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Acceleration of a stirrer

  1. Apr 24, 2015 #1
    1. The problem statement, all variables and given/known data
    Question: There is a fixed 55 cm long rod (vertical) that is charged uniformly up to +137 nC, Place a 0.5 g plastic 6 cm long stirrer (horizontal) that is charge to +93 nC, 2.3 cm away from the rod

    Calculate the Electric force and acceleration on the stirrer .

    2. Relevant equations
    E=Q/4piε r√r^2+(l/2)^2
    F=qE=ma
    3. The attempt at a solution
    upload_2015-4-23_22-28-58.png
     
  2. jcsd
  3. Apr 24, 2015 #2

    haruspex

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    I guess you meant 'finite line', not infinite.
    Try a trig substitution for r. What is suggested by the r2+constant part?
     
  4. Apr 24, 2015 #3
    Let r =sqrt (l/2) tantheta?
     
  5. Apr 24, 2015 #4

    haruspex

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    Looks good.
     
  6. Apr 24, 2015 #5
    Is that reasonable to get a=0.003m/s^2 ?
     
  7. Apr 24, 2015 #6

    haruspex

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    Not sure. Please post what you get algebraically for the solution to the integral.
     
  8. Apr 24, 2015 #7
    Sorry, I left it at school
     
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